Siemens RUGGEDCOM ROX II User Manual page 280

Chapter 7
IP Address Assignment
• For IPv6
services dhcpserver6 shared-network name
Where:
• name is the name of the shared network
3. Configure options for the shared network. For more information, refer to
Network Options".
Type commit and press Enter to save the changes, or type revert and press Enter to abort.
4.
Section 7.3.7.3
Configuring Shared Network Options
To configure options for a shared network on the DHCP server, do the following:
NOTE
Options set at the shared network level override options set at the DHCP server level.
1. Make sure the CLI is in Configuration mode.
2. Navigate to:
• For IPv4
services dhcpserver shared-network{shared network} options
• For IPv6
services dhcpserver6 shared-network{shared network} options
3. Configure the following parameter(s) as required:
IMPORTANT!
For IPv4 only:
If DHCP relay (or Option 82) clients are used on the same subnet as the DHCP server, some clients
will try to renew a lease immediately after receiving it by requesting a renewal directly from the
DHCP server. Because the DHCP server is configured by default to only provide the lease through
a relay agent configured with the current Option 82 fields, the server sends the client a NAK
(negative acknowledgment or not acknowledged) message to disallow the lease. Enabling Option
82 disables the NAK message so the renewal request sent from the DHCP relay agent (which the
DHCP server accepts, since it has the correct Option 82 fields added) is the only message for which
the client receives a reply.
Option 82 support should only be enabled If the DHCP server and clients are on the same subnet.
The meaning of most Option 82 fields is determined by the DHCP relay client. To determine which
values are required by the client for special options, refer to the client documentation.
DHCP relay support can also be enabled on individual subnets. For more information, refer to
Section 7.3.8.3, "Configuring Subnet
Parameter
unknown-client { unknown-client }
234
Options".
Synopsis: { allow, deny, ignore }
The action to take for previously unregistered clients
Section 7.3.7.3, "Configuring Shared
Description
Configuring Shared Network Options
RUGGEDCOM ROX II
CLI User Guide